Error indicator for tabulation cards



March 30,1926. 1,578,717. A D. C. DAUBMEYER ERROR .INDICATOR FOR TABULATION CARDS Filed Se pt 25, 1922 4 Sheets-Sheet 2 D. c DAUBMEYER ERROR INDICATOR FOR TABULATION CARDS March 30 1926. 1,578,717

l-nventoz jai/7' Cjav bm e/er C1 ttor/neral March 30 1926. 1,578,717

' D. C DAUBMEYER ERROR INDICATOR FoR-TABULATION cAnDs Filed sept. 25, 1922 jew? Cj@ Mwe/ef v ador/nut@ 4 sheets-sheet 4 l 6a v I A x Patented Mar. 30.1926.

'UNITED STATESl DEWEY C. DAUBMEYER, OF DETROIT, MICHIGAN.

ERROR INDICATOR FOR TABULATION CARDS.

Application led September 25, 1922. Serial No. 590,473.

being had therein t0 the accompanying drawings.

This invention relates to error indicators for tabulation cards and has special application toimachines through which cards are adapted to be fed either for perforating the same to select certain data on saidcards or for 4verifying the accuracy of perforations previously made. The disclosure if this application to some extent corresponds to that of applicants companion case Serial bar 4 with a r1b 8 upstandmg Aupon the Number 483,426, filed July 9,'1921 It is one of the objects of the inventiontoprovide means for indicating the erroneous provisionof more than one perforation in any data column of a card, said indicating means being applicable to a machine having provision for yadvancing the card transversely of the columns thereof.

A further object is to provide an error indicator for use upon machinesadapted to advance a perforated card which indicator will be energized whenthe erroneous portion of the card has been advanced to a certain point of the mach1ne,.prov 1s 1on being made for continuously maintaining energization of the indicator during completion of the advancement of the card through the machine.

A further feature of the invention' is a provision for controlling an electric c1rcuit by the travel of a card through'a'tabulating machine and automatically breaking said circuit upon removal of the card from the machine.

In the drawings f Figure 1 is a plan view of the improved machine;

Figure 2 is a side view of the same;

Figure 3 is a longitudinal sectional View taken on line 3-,3 of Figure l;

Figure 4 isa cross-section online 4 4 of Figure 3; l

Figure 5 is a horizontal sectional vview taken on line 5 5 of Figure 4;

' Figure 6 is a perspective view. 'of a contact plate employed in controlling the circuit Shown in Figure 25 plungers .20 at a relatively short Figures 7 and 8 are cross sections on line 7-7 and 8,-8 of Figure 3;

Figure 9 is a diagram of the electrical slgnal connections.

In these views, the reference character 1 designates the base of a tabulatin machine veri'tier, and 2 indicates a guide formed between ribs 2u upon the top surface of' said base. Said guideway -provides for the advance longitudinally; .on the machine olf perforated tabulation cards, one o f which is indicated at 3. The card advancing carriage comprises a bar 4 longitudinally extended at one side of the base 1, and card advancing and card retracting arms 5 and 6 respectively projecting above the guideway 2 from the rear and forward ends of the bar 4. The carriage is guided by engagement of rollers 7 at each endof base, and by engagement of fingers 9 and 10 respectively carried upon the outer ends of the arms 5 and 6, in a groovey 11 formed longitudinally in' the guideway 2. The lower edge of the ybar 4 is formed with a rack of teeth 12 engaged by a gear 13 journaled upon a stub-shaft 14, and a spring 15 -coiled ,upon said shaft4 exerts a rotaway tive effort upon said gear tending to J ad vance the carriage. 16 and 17 are escapement pawls alternately engageable with a rack of pointed teeth 18 formed. upon the upper edge of the bar 4 and controlled as hereinafter explained: l

Substantially midway between the ends of the machine a pair of standards 191ris` mounted upon the base 1 respectively at opposite sides of the guideway 2. Between said standards a row of vertical plungers 20 is arranged above the guideway engaging upper and lower spaced guide-bars 21 and 22 rigidly extending between the standards 19. Springs 23 coiled upon said plungers intermedia-te said guide-bars urge the plungers upwardly maintaining their lower ends normally substantially flush with the under-face of the lower bar 22. The plungers 20`are respectively actuable by a corresponding series of key bars 24 extending longitudinally of the machine and engaging above the distance yfrom therear ends of said bars. The forward ends of said key bars respectively engagethevertical stems 25 of a series of keys 26 sultably numbered. The stemsv 25- armountedn a pairof horizontal guide-plates 27 terminall su orted b ins 28risincr from the basye 1 git) each sidepof the guide:- way 2.

Upon the standards 19 is surmounted a plate v29 carrying a casing 30 elongated transversely of the machine. yithin said casing there is mounted a second series of vertical plungers 31, the lower ends of which respectively engage the rear ends of the key bars 24. 1Within said casing the plungers 31 are respectively downwardly urged by coiled springs 32 to establish a normal position in which the upper ends of said plungers 31 are Hush with the top face of the casing 30. For reasons hereinafter made clear, the springs 32 are relatively sti as compared to the springs 23.

Transversely beneath the series of key bars 24 there is extended a 'carriage' escapement release rock bar 33 mounted by a plurality of arms 34 upon a rock shaft 35, and upwardly urged by a ,coiled spring 36 to maintain it just below said key bars in the normal position of the latter. Upon nor` mal actuation of any key bar 24 the escapement release barf33 is rocked downwardly and an arm`37 projecting rigidly forward from the rock shaft 35 is rocked upwardly to `release the pawl 16 from the rack 18v while the pawl 17 is at the same time en-v gaged with'said rack bar by a rearwardly projecting arm38 rigidly mount-ed upon said rock shaft. The carriage undergoes -a very slight advanceas the result of the described adjustment of the escapement pawls` such advance being sufficient to ca rry the point of the rack tooth previously engaged by the pawl 16y clear of the point of said pawl. When the depressed key is released the actuated key bar 24 is returned' to its normal raised position by the corresponding spring 23, and the bar 33 and shaft 35 are also rocked back to their normal positions by the spring 36, the pawl 17 being thus withdrawn from the rack 18, as the pawl 16 engages with said rack. Sincethe point of the pawl 16 now clearsv the previously engaged tooth of the rack 18, the carriage is advanced'by the spring 15 suiciently to engage the next. adjacent tooth of said rack with said pawl. No novelty is claimed for the described escapement mechanism,

In the operationu of the machine as so efar described, upon the actuation of any key 26 the forward end ofthe corresponding key bar is depressed, said bar normally pivoting upon the corresponding plunger 31 and functioning as a lever of the fseeond class to depress the corresponding plunger 2Q. If theproper key has been actuated and a perforation in the card 3 is properly registered with said plunger 20, the latterwill be free to descend and engage in the registered perforation of the card. Under these conditions n'o limitation is placed upon navega? movement of the actuated ke 'bar such as mi ht prevent the release of t e escapement pawls. If, however, there is an error either in striking the proper -key 26, or in thelocation of a'perforation in the card 3, the

plunger 2O used with the actuated key bar .now as a lever of the first class, pivots to raise the corresponding plunger 31 in opposition to the restraining spring 32. Because of the shortening of the leverage occasioned by this change of fulcrum, the rock bar 33 is not depressed sufficiently to effect a release of the escapement, and the card 3 remains stationary. After actuation of any key bar 24 the same is returned toits nor,- mal horizontal position by the corresponding spring 23. j

'It devolves upon the operator, when vthe carriage fails to advance responsive to actuation of any of the keys 26, to first ascertain that the correct key was struck, and if such was thecase, to remove the card to remedy the same as regards the erroneous location of the perforation. lf not infrequently occurs, however, that the operator fails to observe the failureof the carriage to advance, this being Aparticularly liable to happen under certain conditions. One of these conditions is the occurrence of an error which appears just before the card is ready to be removed from the machine, so that the operator, if working carelessly, may remove the card without observing the inaction ofthe carriage responsive to the final depression of a key 26. Furthermore, after failure of the operator to note inaction of the carriage, it may happen that an aperture of the card will register with the plunger 2O depressed uponv the succeeding actuation of alkey 26, so that the carriage will properly respond to actuation of.said succeeding key or possibly to a series of keys actuated following an error thus decreasing the opportunity of the operator to note the` error. It is a further defect of the machine as @o far described that no indication is given yto the operator of the erroneous presence of a plurality of perforations in any column of a card. When lsuch an error is present, operation offthe proper key 26 veries the accuracy of one of the perforations but in no way discloses the presence of the superfluous perforation. s f

T 'e present invention seeks to eliminate the possibilities of error above discussed by providinga signal thatwill be energized by failure lto release the carriage escapement and which will 'remain energized during the buzzer are shown connected in said branch. Said branch 41 is under control'of a relay having the normally open switch 46 inv said branch and having its coil connected in the main portion of the circuit Q9. Thel branch 42 and the branches 43 are normally open and contain means to control energization of the relay coil 47 Thus 48 is a contact plate formed oft brass or' some other good conductor, said plate being hinged,- as indicated at 49, upon an insulating block 50 at the ends of thelatter. The plate 48 is arranged in a slightly spaced relation above the plungers 31 so as to be engaged by any of said plungers upon an upward shifting of the latter from normalposition. Preferably,

the desired normal spaced relation between said plate and plungers is maintained by securing insulating disks 51 tothe under face of said plate, said disks spacing the plate in its normal position above the casing 30 and a coiled spring 51a urging the plate to such position. When any of the plungers 31 make contact with the plate 48 a 'ground connection to the frame of the machine is established, as indicated in the diagram lat 51", sincekthe plungers 31 all vhave electrical connections with the frame of the machine'through the casing 30. The other side ofthe circuit 4`1' is grounded to the frame of the machine, as indicated at 51, this connection being established through a normally opened switch 52 under control of an arm 53 having a curved portion 54 lbearing upon the guide-way 2. The described arrangement is such that insertion of a card 3 beneath the curved end of the arm 5,3 effects a rocking of said arm sulficient to close the switch 52 and establish a ground to the frame through said switch. .Thus when one of the plunger-s 31 rises into contact with the plate 48 dueeither to'actuation of the wrong key 26 or to theerroneous absence of a perforation in the cardi-lregistering with plunger 20 controlled by the actuated key the main circuit 39 is Vclosed .through the branch 42. The depression of the key effecting the initial energi'zation of branch 42 and relay 47 may be onlymomentary b ut a prolonged energization of the relay 1S. maintained/by establishment o f a ground at 55 when the relay is initially energized.v Consequently .the signal branch 41 1s maintainedclosed by the relay 47, this cuit including the grounds 51 and 55 de energized at the switch 52 by removal the card from the machine.

energization continuing until the main cir- As so far described,'the invention provides for a prolongedenergization ofthe signals 44 and 45 in the event of' depression of the wrong key or of an error inthe card involving failure to properly locate-aperforation.

The branches 43 are provided for the purpose of indicating the erroneous presence of two or more perforations in the same column ofthe card. Thus. 55a designates a plurality of resistance coils preferably substantially equal and res ectively included in the branches 43.' Sai( ybranches furthermore respectively include plungers '56'mounted in a block 57 formed preferably of insulating material and lightly bearing upon the guide- Way 2 under the effort of light coil springs 58. Said plungers are adapted to yield up wardly to permit `engagement `of a card 3 beneath the same', the frictional resistance 'of the cards to such movement being minimized by employing balls 59 to transmit the thrust of the plungers to the guide-way (or card). The resistances 55a are of such values as to require energizatin of two or more thereof to establish a sufficient flow of current through the main circuit 39 to opera- 'tively energize the relay 47. Consequently as the columns of any card-'3 are individually co umns are leach correctly perforated at only one point, only one of the plungers 56 Will'establish a groundconnection withthe frame ofthe machine. If, however, the

-re istered with the plungers 56 if said l iegistering column is erroneously perforated at two or more points a plurality of the branches 43 will be energized, producing a current flow adequate to operatively energize the relay 47. The latter will then effect closing of thesignal branch 41, hereinbefore described, and will maintain energization of said branch until the erroneous card has been removed from the machine. Removal of the card permits the switch 52 to open and thus breaks the circuit inclu'd'-v ing ground connections 55,` 51c through which initial energization of the relay coil has been prolonged, as has been described. It is preferred to foi-inthe insulating block 50` ,with a chamber 60 within 'which the resistances 55 are disposed as is best seen 'in Figure 7, and said block may furthermore be utilized as a mounting for the sig-v nal light 44. f f y While the described signal means has been machine of thefverier type it is evident that the inventionis applicable to other tabulatdisclosed in its application to a tabulating ing machines and particularly such machines as are commonly employed for punching the perforations in tabulation cards.

lVhatI claim as my invention is:-

1. In an error indicator, the combination lwith means for rectilinearly advancing a perforated sheet, and control devices adapted to yieldably bear upon said sheet and proportioned to enter the perforations of the sheet, and a signal device responsive to said control devices only through simultaneous energization of a plurality thereof.

2. In an error indicator, the combination `with means for effecting a step by step rectilinear advancement of a perforated sheet, the perforations thereof being spaced in the direction of advancement a distance equal to the unit of advancement, ay signal device, and a plurality of control devices therefor adapted to yieldably bear upon said sheet and proportioned to enter registering perforations of the sheet and means coacting therewith to exercise control of said-signal.

In an error indicator a plurality of keys, means actuable selectively by said keys for effecting'the step by step advancement of a perforated sheet, a row of control devices extending transversely to the direction of travel of the sheet and mounted to bear yieldably upon the sheet and proportioned to enter registering perforations of the sheet to exercise control, a signal device, and means whereby said signal is responsive to said control devices only through simultaneous energization o'f a plurality thereof.

4. In an error indicator, the combination with means for rectilinearly advancing a perforated sheet, of a fixed contact arranged at one s ide of the path of the sheet and movable contacts at the other side of said path mounted to yieldablybear upon the sheet and proportioned to project through registering perforations" of the sheet to engage the fixed contact, circuits controlled byA said movable contacts, and an electric signal adaptel for energization only through a plurality of said circuits.

In an error indicator, the combination with means for rectilinearly advancing a perforated sheet, of an electric signal device, a control circuit for said device having branches in parallel, a contact in said circuit at one side of the path of travel of said sheet. and a plurality of contacts connected in said branches and mounted to` yieldably bear upon said sheet at the other side thereof, and proportioned to project through the perforations of said sheet upon registration therewith to engage said fixed contact.

6. In an error indicator, means -for rectilinearly advancing a perforated sheet, an electric signal device, a circuit for said device' having parallel branches, substantially equal f resistances respectively connected in said said circuit at one side of the path of travel of said sheet, and a roW of contact me-mbers extending transversely to the travel of the sheet and adapted to yieldably bear upon the sheet in opposed relation to said fixed contact, said yieldable members being respectively included in said branches and being proportioned to project through the perforations of the sheet upon registration therewith to close said circuit by engagement with the fixed contact member.

7. In an error indicator, the combination with means for rectilinearly advancing a sheet having data columns extending transversely to its direction of travel and having perforations at selective points in said columns, of a signal device, and means for energizing said device responsive to the presence of more than one perforation in the same column of said sheet.

8. In an error indicator, the combination with means for rectilinearly advancing a perforated sheet, of a signal energized responsive to an error as regards the perforations of said sheet, and means for prolonging energization of said signal until the sheet has been removed from the machine.

9. In an error indicator, the combination with means for rectilinearly advancing a perforated sheet, of an electric signal adapted to be energized through the presence of an error as regards location of the perforations in said sheet, a circuit for said signal and automatic means for breaking said circuit upon removal of the sheet from the machine. Y

10. In an, error indicator, the combination with means for rectilinearly advancing a perforated sheet, of a signal, a relay con trolling said signal, means for breaking the signal circuit automatically through removal of the sheet from the machine, and means for energizing the relay circuit through the erroneous location of a perforation in said sheet.

l1. In an error indicator, the combination with means forrectilinearlyadvancing a perforated sheet, of an electric circuit, a contact in said circuit at one side of the path of said sheet, a plurality of branches in said circuit, and contacts respectively included in said branches and adapted to bear upon the other `side of said sheet respectively in the paths of advancement of the perforations of the card, said contacts having rolling engagement with said sheet.

l2. tion with means for advancing a perforated sheet, of a circuitI controlled. by said sheet, a contact in said circuit arranged at one side In an error indicator, the combinaof said Sheet, and a plurality of branches. -v

connected insa'd'circuit; and contacts controlling said branches arranged to bear upon sheet at the opposite side thereof from branches, a contact member connected in said the rst mentioned contact, and means yield'- ably urging said branch controlling contacts toward said first mentioned contact.

13. In an error indicator, means for advancing a perforated sheet and electric signal device, a control circuit for said device having parallel. branches of substantially equal resistance. a contact and normally opened switches controlling said `branches having control elements registering respectively with thepaths of travel of the perforations of `said card and adapted to close said branches through entry'in registering the perforations.

14. In an error'indicatorhthe combination with means forv advancing a perforated sheet, of a circuit'lncluding an' electric Slgnal, means for mltially Aenergizing said c1rcuit through the presence of an error as regards location of a4 perforation in said sheet, 'a relay forprolongmg energizatlonof the slgnal circult, a switch controlling ener- I gization of the relay, and a,control element ture.

' DEWEY C. DAUBMEYER` 

